重点排烟坡度隧道油罐车火灾通风排烟策略研究

以烟气蔓延距离、2 m高度处能见度以及系统排烟效率作为判定合理断面送风面积的关键性判据。采用FDS对油罐车在1%、3%、5%、7%坡度隧道内的火灾场景进行模拟。结果表明：坡度小于5%时，断面送风面积占比随着坡度增大而增大；而坡度大于5%时，断面送风面积占比保持在80%不变。根据断面送风面积占比和隧道坡度之间的数值关系，提出了无量纲断面送风面积坡度修正系数公式。

Study on ventilation and exhaust strategy of oil tank truck fire in slope tunnel with central smoke extraction system

The smoke spreading distance, visibility at 2 m height and smoke exhaust efficiency of the system are taken as the key criteria to determine the reasonable cross-section air supply area. FDS is used to simulate the fire scene of oil tank truck in 1%, 3%, 5% and 7% slope tunnels. The results show that: When the slope is less than 5%, the proportion of cross-section air supply area increases with the increase of slope; When the slope is more than 5%, the proportion of cross-section air supply area remains at 80%. According to the numerical relationship between the proportion of cross-section air supply area and tunnel slope, the model of non-dimensional cross-section air supply area slope correction coefficient is proposed.